This book was passed down to me from my mum since I was 10 years old. Always loved and hated reading its stories because they were fascinating and horrifying at the same time. Turned to page 367, I found the Hodgeson's story, titled "Knock Twice for Terror".
If you are unfamiliar with the Hodgeson's case in Enfield, London, it was the haunting case that is the main story for The Conjuring 2. Although some of the names of the spirits varried from the movie's and this book's. The story is no less than eerie and violent than depicted, although maybe a bit milder in the movie.
In the movie, Janet alone was possessed by a spirit named Bill Wilkins, and a demon named Valak. In the book however, both Janet and her sister Margaret shared the possession, both spoke in coarse voices of old men and both were favourite targets of the spirits. Yes, plural. As in more than one, which turned out to be 10 spirits, one of which is unknown. Which I believe would be the demon, since the rest were human souls that belonged to a baby, 3 girls, 2 boys, a couple (one of which is Frank Watson, man who died in the chair), and Bill Hobbs. The last unknown soul could have belonged to a man named Joe, unless that's the demon's name, haha.